Results 71 to 80 of about 2,318 (188)

Geoquímica de las rocas asociadas al paleokarst cretácico en la plataforma de Actopan: evolución paleohidrológica

Revista Mexicana de Ciencias Geológicas, 2018
El paleokarst expuesto en las rocas cretácicas de la Plataforma de Actopan (Estado de Hidalgo) permite investigar, mediante la petrología y la geoquímica, la posición de las zonas vadosa y freática que propiciaron la formación del antiguo karst durante ...
Baldomero E. Carrasco-Velázquez, Pedro Morales-Puente, Edith Cienfuegos, Rufino Lozano-Santacruz   +3 more
doaj  

Paleokarst shafts in the western desert of Egypt: A unique landscape

Acta Carsologica, 2013
Paleokarst shafts in the western desert of Egypt: A unique landscapeThe Eocene limestone plateau of the Western Desert of Egypt has various karst features, including shafts created during ancient wet periods.
Ashraf Mostafa
doaj   +1 more source

Karst y paleokarst de Sierra Morena (Sector Ossa-Morena, Hespérico meridional) [PDF]

, 1998
Se presenta una síntesis del karst y paleokarst del sector Ossa-Morena, desarrollado sobre calizas y dolomías del Cámbrico Inferior. Su distribución abarca sectores de las provincias de Huelva, Sevilla y Córdoba.
Baena Escudero, Rafael, Díaz del Olmo, Fernando, Álvarez García, Genaro   +2 more
core  

Alteration of Triassic carbonates in the Buda Mountains —a hydrothermal model [PDF]

, 2009
Large, irregular volumes of altered, friable Triassic dolomite with poorly recognizable depositional fabrics crop out in the Buda Mountains, Hungary. These rock volumes are characterized by powder-like, chalky, soft, whitish gray microporous carbonates ...
Budai, Tamás, Esteban, Mateu, Juhász, Erika, Lapointe, Philippe   +3 more
core   +1 more source

Paleogeomorphy evolution of the Ordovician weathering crust and its implication for reservoir development, eastern Ordos Basin

Petroleum Research, 2018
Gas reservoir development of the Ordovician weathering crust in the Ordos Basin is closely controlled by the pre-Carboniferous paleogeomorphy. Previous studies show that the paleogeomorphy is high in the west and low in the east, and the karst highland ...
Xinshan Wei, Junfeng Ren, Junxing Zhao, Daofeng Zhang, Shunshe Luo, Liubin Wei, Juanping Chen   +6 more
doaj   +1 more source

Plant-dominated assemblage and invertebrates from the lower Cenomanian of Jaunay-Clan, western France [PDF]

, 2014
International audienceTwo fossil localities are reported on the "LGV SEA" railroad from the Lower Cenomanianof Jaunay-Clan (JC), near Poitiers, western France.
Charbonnier, Sylvain, Daviero-Gomez, Véronique, Ferchaud, Patrice, Garcia, Géraldine, Gomez, Bernard, Kirejtshuk, Alexander, Licht, Alexis, Néraudeau, Didier, Valentin, Xavier, Vullo, Romain   +9 more
core   +3 more sources

Differences of carbon and oxygen isotopes in coarse-grained calcite from the Permian Maokou Formation in different regions of Sichuan Basin and their significance in paleokarst environment

Carsologica Sinica
Oil and gas fields in karst carbonate reservoirs are widely distributed in China. A number of karst fracture-vuggy reservoirs have been found in the Tarim Basin, the Ordos Basin and the Sichuan Basin.
Zhaolong GAO, Yong DAN, Xihua ZHANG, Hua CAO, Min DENG, Cong CHEN, Luojia HU   +6 more
doaj   +1 more source

Sequence lithofacies paleogeography and reservoir potential of the Maokou Formation in Sichuan Basin

Petroleum Exploration and Development, 2012
Based on multidisciplinary analyses of outcrops, core description and log data, two types of sequence boundary are identified, including a partially exposed unconformity surface and a drowned unconformity surface.
Mingyi HU, Zhonggui HU, Guoqi WEI, Wei YANG, Mancang LIU   +4 more
doaj   +1 more source

Plio-Pleistocene Dust Traps on Paleokarst Surfaces: A Case Study From the Carpathian Basin

Frontiers in Earth Science, 2020
Plio-Pleistocene silt/clay-rich deposits and paleo-karst fissure sediments from sites of the northern and southern parts of the Carpathian Basin were investigated.
János Kovács, János Kovács, Gábor Újvári, Gábor Újvári, György Varga, Klemens Seelos, Péter Szabó, Péter Szabó, József Dezső, Nadia Gammoudi   +9 more
doaj   +1 more source

Karst monadnock fine characterization and reservoir control analysis: A case from Ordovician weathering paleokarst reservoirs in Lungu area, Tarim Basin, NW China

Petroleum Exploration and Development, 2017
: Based on the fine characterization of weathering crust paleokarst landform of the Ordovician Yingshan Formation in Lungu area, Tarim Basin, the size, number and reservoir controlling characteristics of karst monadnocks have been investigated ...
Yunfeng ZHANG, Fei TAN, Haizhou QU, Zhiqi ZHONG, Yong LIU, Xinsheng LUO, Zhenyu WANG, Fang QU   +7 more
doaj   +1 more source